CD214A-T28ALF Equivalent & Substitute Parts

Part Overview

The CD214A-T28ALF is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 28V reverse standoff voltage with a 45.4V maximum clamping voltage and 8.8A peak pulse current capability in a DO-214AC (SMA) package. The part is classified as obsolete, making identification of functionally equivalent active alternatives necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28	V
Voltage - Breakdown (Min)	31.1	V
Voltage - Clamping (Max) @ Ipp	45.4	V
Current - Peak Pulse (10/1000µs)	8.8	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the CD214A-T28ALF are classified into two categories based on electrical parameter alignment:

Direct Substitutes (Electrical Equivalence): Parts that maintain identical or near-identical electrical specifications across all critical parameters: 28V reverse standoff voltage, 31.1V minimum breakdown voltage, 45.4V maximum clamping voltage, 8.8A peak pulse current, and 400W peak pulse power. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Substitutes (Parameter Variance): Parts that share the same 28V reverse standoff voltage and DO-214AC package but exhibit variations in clamping voltage, peak pulse current, or power dissipation. These parts require circuit-level evaluation to confirm suitability based on application overvoltage protection requirements.

The following parameters determine substitution eligibility:

Reverse standoff voltage (Typ): 28V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Unidirectional Channels: 1
Type: Zener

Parameter Comparison

Part Number	Manufacturer	VWM (V)	Vc (Max) @ Ipp (V)	Ipp (A)	Power (W)	Temp Range (°C)	Status
CD214A-T28ALF	Bourns Inc.	28	45.4	8.8	400	-55 to 150	Obsolete
SMAJ28A	MDD	28	45.4	8.8	400	-50 to 150	Active
SMAJ28A-TP	Micro Commercial Co	28	45.4	8.8	400	-55 to 175	Active
SMAJ28A-TR	STMicroelectronics	28	59	39	400	-55 to 150	Active
SMA6J28A-TR	STMicroelectronics	28	51.6	68	600	-55 to 175	Active
SM4T33AY	STMicroelectronics	28	59	39	400	-55 to 150	Active
SMAJ30A-M3/5A	Vishay General Semiconductor	30	48.4	8.3	400	-55 to 150	Active
SMAJ30A-M3/61	Vishay General Semiconductor	30	48.4	8.3	400	-55 to 150	Active
SMA6J24A-M3/5A	Vishay General Semiconductor	24	37.8	15.9	600	-55 to 150	Active
SMA6J24A-M3/61	Vishay General Semiconductor	24	37.8	15.9	600	-55 to 150	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Equivalence):

SMAJ28A (MDD) and SMAJ28A-TP (Micro Commercial Co) provide direct electrical equivalence to the CD214A-T28ALF with identical voltage and current specifications. Both are active products with ROHS3 compliance and MSL 1 rating. SMAJ28A-TP offers an extended operating temperature range (-55 to 175°C) compared to the original part (-55 to 150°C), providing additional thermal margin. SMAJ28A from MDD maintains the original temperature specification with a minimum operating temperature of -50°C.

Secondary Substitutes (Enhanced Performance):

SMAJ28A-TR (STMicroelectronics) and SM4T33AY (STMicroelectronics) maintain the 28V reverse standoff voltage but feature elevated clamping voltage (59V) and significantly higher peak pulse current (39A at 8/20µs). These parts are suitable for applications requiring enhanced transient suppression capability. SMA6J28A-TR (STMicroelectronics) offers the highest performance envelope with 51.6V clamping voltage, 68A peak pulse current, and 600W power dissipation, with extended temperature range to 175°C.

Voltage-Variant Alternatives:

SMAJ30A-M3/5A and SMAJ30A-M3/61 (Vishay) provide 30V reverse standoff voltage with 48.4V clamping voltage and 8.3A peak pulse current. These parts are suitable only where circuit design accommodates the higher standoff voltage. SMA6J24A variants (Vishay) operate at 24V standoff voltage and are not recommended as direct replacements due to voltage mismatch.

All recommended substitutes maintain DO-214AC (SMA) package compatibility, surface-mount configuration, and ROHS3 compliance with MSL 1 rating.

Frequently Asked Questions (FAQ)

Q: Can SMAJ28A-TR be used as a direct replacement for CD214A-T28ALF?

A: SMAJ28A-TR shares the 28V reverse standoff voltage and DO-214AC package but exhibits different clamping characteristics (59V vs. 45.4V) and significantly higher peak pulse current (39A vs. 8.8A). Substitution requires circuit-level verification that the application can tolerate the higher clamping voltage without exceeding downstream component voltage ratings.

Q: What is the difference between SMAJ28A from MDD and SMAJ28A-TP from Micro Commercial Co?

A: Both parts provide identical electrical specifications (28V standoff, 45.4V clamping, 8.8A peak pulse, 400W power). The primary difference is operating temperature range: SMAJ28A operates -50 to 150°C while SMAJ28A-TP operates -55 to 175°C. SMAJ28A-TP is preferred for applications requiring extended low-temperature operation or thermal margin.

Q: Are SMAJ30A parts suitable replacements?

A: SMAJ30A-M3/5A and SMAJ30A-M3/61 operate at 30V reverse standoff voltage, which is 2V higher than the CD214A-T28ALF. These parts are not direct substitutes and require circuit redesign to accommodate the higher standoff voltage threshold. Use only if application design permits voltage adjustment.

Q: What packaging options are available for these substitutes?

A: All listed substitute parts use DO-214AC (SMA) surface-mount packaging, maintaining mechanical and thermal compatibility with the original CD214A-T28ALF. Packaging variants (Tape & Reel, Cut Tape, Digi-Reel) affect procurement and handling but do not alter electrical performance or board-level compatibility.

Q: Are all substitutes RoHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental compliance profile.

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